ACCRUED EXPENSES (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Accrued Expenses [ABSTRACT]
Insurance	$ 22,609	$ 21,712
Interest	5,716	15,434
Accrued disposal costs	2,495	2,455
Accrued compensation and benefits	36,494	56,029
Income, real estate, sales and other taxes	18,302	14,863
Other	28,885	37,499
Total accrued expenses	$ 114,501	$ 147,992